OpenMultiboot issue

Hi Friends
ia have some problems with my duo2 (openatv5.1 in flash).
1- when zapping the image shows for a few seconds then black screen fo a moment (only in openatv and vti).
2-i installed other images in openmultiboot but two of them shown by same name of the image in flash (openatv 5.1) even they are shown woth their correct names in dcc.
3- i could not install my own backup in openmultiboot and i had always this message:can not deflate image.
any help will be appreciated guys.
thanks in advance